ifnames - Unix, Linux Command

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NAME

ifnames - Extract CPP conditionals from a set of files

SYNOPSIS

ifnames [OPTION] ... [FILE] ...

DESCRIPTION

Scan all of the C source FILES (or the standard input, if none are
given) and write to the standard output a sorted list of all the
identifiers that appear in those files in #if, #elif, #ifdef, or
#ifndef directives. Print each identifier on a line, followed by a
space-separated list of the files in which that identifier occurs.